what i need is to pick someones brain about whether or not a 1966 c4 would bolt onto a 1977 302.from a thunderbird.... the trans came in the 66 mustang that i bought and was attached to a 289 so i dont know if the bolt patterns will match and if they do can i find a bellhousing from a 77 trans and swap it onto the 66 trans that i have?

I reckon its a 302 windsor If its in a 77 thunderbird, is the thermostat housing on the inlet manifold if it is its a windsor ,cleveland ones bolt to the block.
Count the bolt holes (the 5/8 bolt ones )if there both have six the should bolt together.2 holes on the trans are for dowels fitted to the block dont count them.
When you fit them to gether make sure the torque converter is properly engaged all the way into the trans before fitting otherwise you can seriously damage the trans when bolting the motor/trans together.